The Wealth of Nations by Part 1 Chapter 10 Page 128

aside all endeavours to bring under strict regulations, what in its own nature seems incapable of minute limitation; for if all persons in the same kind of work were to receive equal wages, there would be no emulation, and no room left for industry or ingenuity.”

Particular Acts of Parliament, however, still attempt sometimes to regulate wages in particular trades and in particular places. Thus the 8th of George III prohibits under heavy penalties all master tailors in London, and five miles round it, from giving, and their workmen from accepting, more than two shillings and sevenpence halfpenny a day, except in the case of a general mourning.

Whenever the legislature attempts to regulate the differences between masters and their workmen, its counsellors are always the masters.